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Share-Based Compensation Additional share based compensation expense related to PBRSUs (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | The following table details expected additional share-based compensation expense related to PBRSUs currently outstanding:
(In thousands) |  |
2018 |  | $ | 2,446 |
2019 |  | 1,818 |
2020 |  | 822 |
2021 |  | 137 |
Total |  | $ | 5,223 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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